Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/10—Dispersions; Emulsions
  • A61K9/107—Emulsions ; Emulsion preconcentrates; Micelles
  • A61K9/113—Multiple emulsions, e.g. oil-in-water-in-oil
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K39/00—Medicinal preparations containing antigens or antibodies
  • A61K39/39—Medicinal preparations containing antigens or antibodies characterised by the immunostimulating additives, e.g. chemical adjuvants
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K9/00—Medicinal preparations characterised by special physical form
  • A61K9/10—Dispersions; Emulsions
  • A61K9/107—Emulsions ; Emulsion preconcentrates; Micelles
  • A61K9/1075—Microemulsions or submicron emulsions; Preconcentrates or solids thereof; Micelles, e.g. made of phospholipids or block copolymers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P33/00—Antiparasitic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P37/00—Drugs for immunological or allergic disorders
  • A61P37/02—Immunomodulators
  • A61P37/04—Immunostimulants
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K39/00—Medicinal preparations containing antigens or antibodies
  • A61K2039/555—Medicinal preparations containing antigens or antibodies characterised by a specific combination antigen/adjuvant
  • A61K2039/55511—Organic adjuvants
  • A61K2039/55566—Emulsions, e.g. Freund's adjuvant, MF59

Definitions

• This disclosure concerns the field of pharmaceutical compositions, in particular, the field of vaccines. More precisely, the disclosure concerns a pharmaceutical composition useful as a vaccine (or vaccine composition) and a method for preparing the vaccine composition.
• adjuvants for vaccines have been used for many years and are defined as compositions which, when combined with an antigen, produce an immune response greater than that of the antigen alone.
• the immunogenic power of a vaccine without an adjuvant is weak as a rule, particularly when an inactivated virus is involved or when the antigen is simply a peptide or a protein and does not in itself make it possible to induce a protective response.
• Alum (aluminium phosphate and hydroxide) is an adjuvant the use of which is widespread in human and veterinary vaccines.
• adjuvants are known and used for research such as Freund's adjuvant constituted of a mixture of mineral oil and killed mycobacterium. This adjuvant is extremely effective and products pronounced immune responses. Its poor tolerance, however, limits its use to research in laboratory animals.
• U.S. Pat. No. 4,788,056 describes a combined vaccine against herpes and E. coli intended for vaccination of livestock. It mentions various different possible adjuvants, including oil/water emulsions or water/oil emulsions based on certain oils such as MIGLYOL® (medium-chain triglycerides) or surfactants such as polysorbate without, however, indicating any precise formulation of the adjuvant. Conventional emulsions are, however, involved in which the dispersed phase exists in the form of droplets. Furthermore, no indication is given with regard to the effect of the adjuvant on the immunogenic power of the vaccine.
• oils such as MIGLYOL® (medium-chain triglycerides) or surfactants such as polysorbate
• U.S. Pat. No. 5,688,761 describes a water in oil microemulsion formulation which converts into an oil in water system by addition of an aqueous fluid, which results in release of the protein contained in the aqueous phase.
• the advantage of microemulsions is their spontaneous formation and their physical stability.
• the oils are well tolerated via the injectable route such as medium-chain mono and triglycerides. They are emulsified with the aqueous phase by means of the use of conventional surfactants known by one skilled in the art such as sorbitan esters or polysorbates. Their dilution by biological fluids during their injection results in inversion of the phases and, therefore, release of the biological agent incorporated in the aqueous phase.
• Certain examples of formulation show an increase in the activity of biological agents incorporated into the described formulation. However, the examples provided do not concern the field of vaccines.
• U.S. Pat. No. 5,744,137 describes use of non-mineral oils in vaccines, in addition to vaccines in the form of water in oil emulsions containing a mixture of at least two surfactants chosen from among ethoxylated castor oil, propylene glycol laurate, propylene glycol caprylate and isosteryl diglyceryl succinate.
• the chosen oils are of animal or plant origin to limit in as far as possible the tissue reaction related to administration of poorly tolerated mineral oils.
• U.S. Pat. No. 5,961,960 describes a vaccine adjuvant presented in the form of an oil in water submicroemulsion comprising an emulsifier (a phospholipid is involved), a non-ionic surfactant and an oil.
• an emulsifier a phospholipid is involved
• a non-ionic surfactant a non-ionic surfactant
• US 2003/0175309 describes and adjuvant containing lecithin, an oil and an amphiphilic surfactant capable of forming a vaccine in the form of a stable oil in water emulsion which makes it possible to minimize local reactions in the infected animal.
• WO 99/61003 describes a system for delivering active substances comprising a drug reserve in closely compacted solid form with an isotropic structure in the solid state. This system is adequate for delivering active substances by inhalation.
• the active substance comes in the form of liposomes, the liposomes being subsequently compacted to form the solid delivery system described.
• EP 0 398 287 describes a pharmaceutical composition in the form of an isotropic solution consisting of one or several active substances and a medium which solidifies between 20° C. and 80° C. (particularly at ambient temperature) and is soluble in water.
• compositions available when the antigen is costly or difficult to produce in sufficient quantities or when a simple peptide or antigens obtained by synthesis or recombination is involved.
• a pharmaceutical composition including at least a mixture of at least one oil, at least one surfactant and an aqueous phase, itself including at least one active substance, the pharmaceutical composition not being in the form of an emulsion, but in the form of an oily isotrope.
• We also provide a method of preparing the composition including, during an initial stage, the antigen is dissolved or dispersed in the aqueous phase and the mixture is heated at a temperature of between about 30 and about 60° C.; during a second stage, which may be concomitant with the first, the surfactant or surfactants are mixed with the oil and the mixture is heated at a temperature of between about 30 and about 60° C.; during a third stage, the aqueous phase is incorporated in the oily phase using a homogenizer; and during a fourth stage, an oily isotrope obtained, cooled to ambient temperature and sterilized.
• a pharmaceutical composition in the form of an oily isotrope at least composed of a ternary mixture of oil/surfactant(s)/aqueous phase, the aqueous phase comprising the antigenic substance, is capable of having a markedly greater immunogenic power than a ternary composition of the former art in the form of an emulsion, in non-isotropic form.
• a composition in isotropic form may possess a viscosity compatible with administration by injection.
• isotrope will be used hereafter to denote the oily isotrope, i.e. the isotropic ternary mixture of oil/surfactant(s)/aqueous phase.
• isotrope comprising an antigenic substance will denote a composition in which the antigenic substance is included in the aqueous phase of the oily isotrope.
• Oily isotrope means a mixture of oil, water and surfactants, the proportions of which are adjusted in such a manner that the preparation obtained is limpid, clear and has a low level of viscosity. In this manner, such a composition can be administered by injection.
• This type of composition corresponds to a dissolution of water in oil, or more specifically water in a micelle, itself being in oil (oily isotrope).
• molecular aggregates of surfactant form known as micelles, in which the active is more or less deeply inserted.
• Isotropes are well known and can be found in Galenica, 1983, Vol. 5, chapter 5, page 195-219, for example.
• this work has water/oil/surfactant ternary diagrams, for example, a water/oil diagram of paraffin/Brij 96 on page 203, allowing determination of the respective concentrations of these compounds for which an isotropic system is obtained.
• composition in isotropic form has a continuous three-dimensional structure, also known as a monophasic structure.
• Emulsions for their part are formed of a system of two non-miscible liquids, one of which is finely divided into drops or vesicles, in the other.
• the dispersed phase is known as the internal or discontinuous phase and the dispersing phase is known as the external or continuous phase.
• An emulsion is, therefore, a liquid-liquid dispersion that possesses a biphasic structure.
• a composition in isotropic form differs from an emulsion by the absence of organization of the vesicle type and by the presence of micelles.
• Organization of the vesicle type means a structure having a wall comprising or constituted by components of the surfactant type, the wall including a volume comprising or constituted of a hydrophilic internal phase when the external phase is hydrophobic and vice-versa.
• a pharmaceutical composition comprising at least a mixture of at least one oil, at least one surfactant and an aqueous phase, itself comprising at least one active substance, the pharmaceutical composition being in the form of an oily isotrope.
• This composition is in isotropic form and, therefore, not in the form of an emulsion.
• the composition has a viscosity compatible with administration by injection.
• the active substance may be any type of biological active substance such as a living, attenuated or inactivated antigen.
• a living antigen signifies: a bacterium or a virus attenuated empirically or genetically, a proteinic (or glyco-lipoproteinic) antigen expressed in vivo by a vector (recombinant bacterium or virus).
• An inactivated antigen means a bacterium or virus inactivated either by physical methods or by chemical methods or a bacterial or viral extract, or a protein, a polypeptide or a peptide obtained by genetic recombination or by chemical synthesis, or at least an in vivo generator of a compounds comprising a sequence of amino acids.
• the biological active substance may be inert.
• the pharmaceutical composition may be a vaccine.
• the active substance is an antigen.
• the antigen may be of any origin and in any form commonly used in the field of vaccination.
• the antigen may, for example, be of viral, bacterial, parasitic or even tumoural origin.
• the antigen may be natural or recombinant.
• microorganism virus, bacteria or parasites
• attenuated or inactivated if appropriate, or fractions, particularly acellular fractions, of said microorganism (purified antigens, native proteins or glycoproteins or peptides, polynucleotides, whether synthetic or produced by genetic engineering in particular), or indeed based on water-soluble or water-dispersible antigens.
• an antigenic phase composed of molecules excreted by the microorganism is used whether components of the bacterial wall or components of the cytoplasm.
• the quantity of active substance and/or antigen in the composition is a function of the desired effect and the very nature of the active substance or the antigen used.
• One skilled in the art is capable of assaying the latter as a function of the active substance or antigen used.
• the proportions of each of the constituents of the isotrope are adjusted so that the whole forms an oily isotrope.
• the surfactant concentration may be greater than the critical micelle concentration (CMC).
• CMC critical micelle concentration
• the essential portion of the surfactant is in monomer form.
• micelles there is an appreciable presence of micelles.
• the CMC value may be determined by various different methods, for example, conductimetry or spectrophotometry, particularly as described in Dominguez et al., “Journal of Chemical Education”, 1997, 1227-1231.
• the CMC corresponds to a sudden change in the variation law of the parameter measured, for example the conductance or the absorbance.
• compositions may comprise a surfactant content greater than or equal to the critical micelle concentration.
• This critical micelle concentration depends on several parameters including the nature of the components present in the composition and their content.
• the composition will comprise at least a high surfactant concentration and a low quantity of water.
• the composition may comprise between about 10% to about 90% of oil, preferably about 40% to about 75% in weight, in relation to the weight of the total composition.
• the quantity of water in the composition may be between about 0.5% and about 20%, preferably between about 3% and about 9% in weight, in relation to the weight of the total composition.
• the quantity of surfactant in the composition may be between about 1% and about 60%, preferably between about 16% and about 45% in weight, in relation to the weight of the total composition.
• the ratio of the quantity of water to the quantity of oil must not be less than 1 (quantity of oil equal to the quantity of water) and preferably should not be less than about 5 (quantity of oil at least 5 times greater than the quantity of water).
• oils may be used in the composition.
• the oil must be compatible with pharmaceutical use, particularly injectable administration via the parenteral route.
• the oil may be selected from among:
• an oil such as squalene or preferably an oil of the triglyceride family and very preferably medium-chain triglycerides of the MIGLYOL 810® type.
• the surfactants may be anionic, cationic, non-ionic or amphoteric.
• the preferred class owing to its good safety, particularly during an injection, is that of the non-ionic surfactants.
• all those usable via the injectable route may be used alone or in a mixture.
• polysorbates sorbitan esters, particularly esters of sorbitan and fatty acid, polyoxyethylenated derivatives of castor oil, polyoxyethylenated derivatives of stearic acid, copolymers of ethylene oxide and propylene oxide or poloxamers, esters of saccharose and fatty acid, esters of glycol and fatty acid, mono-, di-, tri-ester of fatty acid and glycerol, esters of polyethylene glycols and fatty acid and esters of saccharose and fatty acids.
• the polysorbates and sorbitan esters particularly the esters of sorbitan and fatty acid are used.
• HLB's hydrophilic-lipophilic balance, which is a characteristic of the surfactants, related to the structure of their molecule).
• the surfactants have different HLB's to come near to the critical HLB of the oily phase used.
• the critical HLB is a function of the concentration of the emulsifiers and the chemical nature of the surfactants.
• the aqueous phase may contain, in addition to the water-soluble or water-dispersible antigen and water, other substances such as salts designed to complex the antigen in order to delay its release and therefore prolong its action.
• other substances such as salts designed to complex the antigen in order to delay its release and therefore prolong its action.
• salts designed to complex the antigen in order to delay its release and therefore prolong its action.
• alumina silicate or calcium phosphate examples of this type of salts.
• the composition possesses a viscosity of between about 5 and about 150 mPa ⁇ s and preferably between about 5 and about 100 mPa ⁇ s.
• the viscosity of the composition is measured at ambient temperature, preferably at 25° C., using rotor-stator-type viscosimeter, such as a Rhéo brand viscosimeter designated HAAK-VT500, according to the manufacturer's prescriptions.
• composition may be prepared by any operating method known in the art.
• a composition may be prepared by the following operating method:
• starting materials which are themselves sterile and conduct the entire manufacture in a clean room to avoid being obliged to resort to a final sterilization operation.
• the same aqueous phase containing the antigen is used. It involves an acellular antigenic phase composed of antigens excreted during culture of a bacterial strain of Streptococcus suis . This bacterium is responsible for a severe and highly widespread disorder in piglets.
• the infection is characterized by nervous disorders (lack of motor coordination, trembling and convulsions) and joint disorders. Cases of septicaemia have also been reported, in addition to lung lesions. Transmission to humans is possible (abattoir workers, veterinary staff).
• MRP Muramidase Released Protein
• titer of which may be determined by ELISA test (enzyme-linked immunosorbent assay).
• An anti-MRP monoclonal antibody is fixed in the wells of a microtitration plate. Following a saturation phase which makes it possible to avoid non-specific adsorption, the vaccine (containing the antigen to be assayed) is diluted and transferred to each well. After washing, a monoclonal antibody directed against the MRP protein and coupled to an enzyme is added. The reaction with the substrate/chromogen of the enzyme makes it possible to obtain a colored reaction measured using a plate reader. The intensity of the colorating is directly proportional to the quantity of antigen in the vaccine.
• the aliquot of primary solution containing the desired quantity of antigens is diluted to necessary and sufficient quantity of a buffer commonly used in the field of vaccines, such as phosphate buffer for example.
• a buffer commonly used in the field of vaccines such as phosphate buffer for example.
• the MIGLYOL 810®, TWEEN 80® and the SPAN 80® are mixed in a beaker.
• the oily phase obtained is heated on a water-bath at 40° C.
• the aqueous phase is also heated on a water-bath at 40° C.
• the aqueous phase is added to the oily phase dropwise, homogenizing with a turbine mixer (RAYNERI® 33300) rotating at 500 rpm.
• a turbine mixer (RAYNERI® 33300) rotating at 500 rpm.
• the mixture Once the mixture has been performed, it is removed from the water-bath and allowed to cool at ambient temperature.
• the target MRP protein titre of the finished product is 1.6.
• the target titre is a titre relative to a reference antigen having a theoretical and arbitrary titre of 1. (1.6 means that the vaccine has a titre 1.6 times greater than the reference used).
• the target MRP protein titre of the finished product is 1.6.
• the MIGLYOL 810®, TWEEN 80® and SPAN 80® are mixed in a beaker. This mixture is sterilized by heating to 120° C. for 30 minutes and subsequently allowed to cool at ambient temperature.
• the aqueous phase containing the antigen is sterilized by filtration over a synthetic membrane with a porosity of 0.22 ⁇ m.
• the oily phase obtained above is heated in parallel and separately and the aqueous phase is prepared according to example 1 in a water-bath at 40° C.
• the aqueous phase is added dropwise to the oily phase homogenizing with a turbine mixer (RAYNERI® 33300) rotating at 500 rpm.
• the two beakers are kept at the temperature.
• the mixture Once the mixture has been prepared, it is removed from the water bath and allowed to cool at ambient temperature.
• the target MRP protein titre of the finished product is 1.6.
• composition 1 of example 2 is compared with that of other compositions comprising an adjuvant or adjuvants described in the literature and known in the art.
• the method used is the following:
• aqueous phase obtained in example 1 and the adjuvant are mixed while stirring for 20 seconds using the RAYNERI® T33300 homogenizer rotating at 150 rpm.
• Control formulation 3 commercial oil/water adjuvant (MONTANIDE® ISA 763 VG, SEPPIC)
• Aqueous phase containing the antigen (example 1) 30.00 MONTANIDE ® ISA 763 VG 70.00
• the aqueous phase obtained in example 1 is filtered over a 0.22 ⁇ m nylon filter and the adjuvant over a PTFE filter with a porosity of 0.22 ⁇ m, the whole being assembled aseptically.
• the adjuvant is transferred to a beaker while stirring at 800 rpm using a RAYNERI® T33300 homogenizer.
• the antigenic aqueous phase is incorporated in a single operation, while stirring at 1200 rpm, maintained for 30 minutes.
• Control formulation 4 water in oil commercial adjuvant (MONTANIDE® ISA 563 VG, SEPPIC)
• the aqueous part of the formulation is filtered over a 0.22 ⁇ m nylon filter and the adjuvant over a PTFE filter with a porosity of 0.22 ⁇ m, the whole being assembled aseptically.
• adjunct adjuvant is transferred to a beaker while stirring at 800 rpm using a RAYNERI® T33300 homogenizer.
• the antigenic aqueous phase is incorporated in a single operation, while stirring at 1200 rpm, maintained for 15 minutes.
• Control formulation 5 LH adjuvant according to patent application WO 01/40240
• Aqueous phase containing the antigen (example 1) 25.00 Saline buffer (PBS) 25.00 LH 50.00
• the aqueous adjuvant LH is sterilized by the supplier and received as is.
• the aqueous antigenic phase and the saline buffer are mixed by magnetic stirring for 5 to 10 min. and the LH adjuvant is subsequently added very slowly (“in a trickle”) to the antigenic phase-saline buffer mixture. Stirring is maintained for 10 min.
• the MRP protein titers, measured as described above, of the reference formulations are approximately 4 (in RP units (Relative Potency: measurement unit by Relative Potency Calculation Software, version 3.0, US Department of Agriculture).
• composition 1 in example 2 was compared with those of the Control compositions following the experimental protocol below:
• the values indicated are relative: the value indicated represents the immunogenic power of a composition with reference to the immunogenic power of reference no. 5 which served as a reference for assessment of the immunogenic power of each reference tested.
• composition 1 which contains 4 and 6 times less antigen than references 1 and 4, induces an immunological response between 2 and 80 times greater than that induced by these same controls.
• composition 1 composition 1
• composition 5 composition 5

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